Humulus lupulus
A perennial climbing plant whose female cones flavor and preserve beer.
**Humulus lupulus**, the common hop, is a flowering perennial in the Cannabaceae family—the same group as hemp and marijuana. It is a herbaceous climber that emerges anew each spring from a cold-hardy rhizome, then dies back in autumn. The plant is dioecious, meaning male and female flowers grow on separate individuals, and it is native to West Asia and Europe, though it has been introduced and naturalized in North America. Its female cone-shaped flowers, called hops, are widely farmed for the brewing industry, where they preserve and flavor beer.
The plant can reach up to 10 meters tall and live for about 20 years. Its leaves are simple, with three to five deep lobes, and may be arranged opposite or alternate along the stem. Flowering is triggered by longer summer days, typically occurring in July or August in the Northern Hemisphere. The fragrant flowers are wind-pollinated: male flowers lack petals, while female flowers also lack petals; the cone is composed of bracts and bracteoles, not petals. The female cones (strobili) are the hops. The fruit is a dry, non-splitting achene, surrounded by bracts and dotted with glands that secrete lupulin. Because the plant climbs using stiff, downward-facing hairs for stability, it is sometimes called a bine rather than a vine.
Chemically, *H. lupulus* contains myrcene, humulene, xanthohumol, myrcenol, linalool, and various tannins and resins. Hops are unique for their secondary metabolites—flavonoids, oils, and polyphenols—that shape the flavor of beer and other hop-infused products. The bitter taste comes from acids made of prenylated polyketides, a group of secondary metabolites. Several genes influence this bitterness, including O-methyltransferase 1, geranyl diphosphate synthase, and chalcone synthase. Genomic studies show that thousands of years of human selection have enhanced aroma, bitterness, and yield in cultivated varieties.
The plant’s growth, flowering, and stress responses are linked to homologous primary contigs—overlapping DNA sequences inherited from a common ancestor—that show high sequence variation. Genes with higher divergence rates in these regions are tied to flowering, growth, and responses to both abiotic and biotic stress. These stress responses help explain differences in cultivation difficulty among geographically distinct hop varieties. Environmental stressors like temperature shifts a
- Scientific name
- Humulus lupulus
- Family
- Cannabaceae
- Lifespan
- Up to 20 years
- Maximum height
- 10 metres (33 feet)
- Native range
- West Asia, Europe (introduced and naturalized in North America)
- Known for
- Female flower cones (hops) used in beer brewing
Quick Facts
- Genus
- Humulus
- Species
- lupulus
Facts from the source article.
Lore & Background
Humulus lupulus is a dioecious plant, with male and female flowers on separate plants. It sends up new shoots in early spring and dies back to a cold-hardy rhizome in autumn. The plant is triggered by longer summer days to flower, usually around July or August in the Northern Hemisphere. The fragrant flowers are wind-pollinated, and the female flower cones, known as hops, contain lupulin-secreting glands concentrated on the bracts and bracteoles. The fruit is an achene. The species is sometimes described as a bine rather than a vine because it has stiff downward-facing hairs that provide stability and allow it to climb.
Reader's Guide
Humulus lupulus is significant primarily for its role in the brewing industry, where the female cones (hops) are used to preserve and flavor beer. The plant contains secondary metabolites, including bitter acids composed of prenylated polyketides, which highly impact the taste of hop-based products. Genomic analyses show that human selection over thousands of years has enhanced aroma, bitterness, and yield. The plant also contains xanthohumol, which can be converted by gut bacteria into a phytoestrogen, and its extracts have antimicrobial and sleep-aiding properties. However, environmental stress, such as changes in temperature and water availability, can reduce the expression of genes involved in bitter acid production, potentially affecting cultivation under climate change. The hop genome is large and complex, similar in size to the human genome, making genetic study challenging. The plant shares about 73% genomic overlap with Cannabis sativa, including the cannabidiolic acid synthase gene, which has spurred interest in potential unknown compounds.
Did You Know?
- The specific epithet 'lupulus' is Latin for 'small wolf,' referring to the plant's tendency to strangle other plants like a wolf does a sheep.
- The English word 'hop' is derived from the Middle Dutch word 'hoppe.'
- Extracts of bitter alpha-acids in hops have been shown to decrease nocturnal activity, acting as a sleep aid.
- The hop plant diverged from Cannabis sativa over 20 million years ago and is about three times its physical size.
Frequently Asked Questions
What is Humulus lupulus?
It is a perennial climbing vine that pushes fresh growth from an underground rhizome every spring and then dies back each autumn. It sits in the Cannabaceae family, the same botanical group as hemp and marijuana.
What family does Humulus lupulus belong to?
It is classified under Cannabaceae, which also houses hemp and marijuana. The species is dioecious, so male and female flowers always appear on separate individual plants.
How tall can Humulus lupulus grow?
The herbaceous vine can climb as high as 10 metres (roughly 33 feet) during a single growing season. It relies on its cold-hardy rhizome to regenerate new stems each spring.
What are the female cones of Humulus lupulus used for?
The cone-shaped female flowers, known commercially as hops, are the part cultivated for the brewing industry. In beer they perform two jobs: imparting flavor and acting as a natural preservative.
Where is Humulus lupulus native to?
It is indigenous to West Asia and Europe. The plant has since been introduced to North America, where it has taken hold and naturalized in the wild.
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